Adaptive sampling leads to evidentiation of rendering tiles
You will likely get better results by using either the Denoiser or Adaptive Sampling - instead of activating both at the same time.
The reason for this is that the Adaptive Sampling feature stops rendering an individual tile when the noise of those samples gets below a threshold, while the denoiser attempts to deal with any noise present over the whole render. By using both at the same time it’s resulting in varying levels of noise in adjacent tiles and the denoiser cannot cope with it, resulting in edge of tile artifacts.